Merge pull request from GHSA-mg26-v6qh-x48q

src/lib/ares__read_line.c

@@ -59,6 +59,14 @@ ares_status_t ares__read_line(FILE *fp, char **buf, size_t *bufsize)
       return (offset != 0) ? 0 : (ferror(fp)) ? ARES_EFILE : ARES_EOF;
     }
     len = offset + ares_strlen(*buf + offset);
+
+    /* Probably means there was an embedded NULL as the first character in
+     * the line, throw away line */
+    if (len == 0) {
+      offset = 0;
+      continue;
+    }
+
     if ((*buf)[len - 1] == '\n') {
       (*buf)[len - 1] = 0;
       break;